18351666985 has 8 divisors (see below), whose sum is σ = 22025067840. Its totient is φ = 14679288624.

The previous prime is 18351666947. The next prime is 18351667021. The reversal of 18351666985 is 58966615381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18351666985 - 2¹⁹ = 18351142697 is a prime.

It is a super-2 number, since 2×18351666985² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215565 + ... + 288394.

It is an arithmetic number, because the mean of its divisors is an integer number (2753133480).

Almost surely, 2^18351666985 is an apocalyptic number.

It is an amenable number.

18351666985 is a deficient number, since it is larger than the sum of its proper divisors (3673400855).

18351666985 is an equidigital number, since it uses as much as digits as its factorization.

18351666985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511247.

The product of its digits is 9331200, while the sum is 58.

The spelling of 18351666985 in words is "eighteen billion, three hundred fifty-one million, six hundred sixty-six thousand, nine hundred eighty-five".